Golang : Convert decimal number(integer) to IPv4 address
Problem :
You've read the previous tutorial on how to convert IPv4 address to decimal number and store into database. However, now you want to convert the decimal value back to IPv4 address. How to do that?
Solution :
Reverse the algorithm used in the conversion to decimal number. However, to get the correct result, we need to do two bit shifting and “0xff” masking.
For example :
package main
import (
"fmt"
"strconv"
)
func InttoIP4(ipInt int64) string {
// need to do two bit shifting and “0xff” masking
b0 := strconv.FormatInt((ipInt>>24)&0xff, 10)
b1 := strconv.FormatInt((ipInt>>16)&0xff, 10)
b2 := strconv.FormatInt((ipInt>>8)&0xff, 10)
b3 := strconv.FormatInt((ipInt & 0xff), 10)
return b0 + "." + b1 + "." + b2 + "." + b3
}
func main() {
// 1653276013 = 98.138.253.109
IPv4 := InttoIP4(1653276013)
fmt.Println(IPv4)
}
Output :
98.138.253.109
References :
https://processing.org/reference/bitwiseOR.html
http://stackoverflow.com/questions/12130464/ip-address-conversion-to-decimal-and-vice-versa
See also : Golang : Convert IPv4 address to decimal number(base 10) or integer
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+15.4k Golang : Archive directory with tar and gzip
+18.9k Golang : Calculate time different
+10.6k Golang : Submit web forms without browser by http.PostForm example
+4.8k Golang : Get expvar(export variables) to work with multiplexer
+7k Golang : Terminate-stay-resident or daemonize your program?
+10.1k Golang: Pad right or print ending(suffix) zero or spaces in fmt.Printf example
+3.7k Golang : What is StructTag and how to get StructTag's value?
+4.5k Javascript : Push notifications to browser with Push.js
+10k Golang : How to get URL port?
+3.7k Golang : How to fix html/template : "somefile" is undefined error?
+3.8k Unix/Linux : How to open tar.gz file ?